CLAS physics database search results Measurement E159M271 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.354518 0.0476578 90 0.425281 0.0614369 150 0.602838 0.0788555 210 0.589891 0.0769874 270 0.458257 0.0639459 330 0.385785 0.0514634